# Question about PH and runoff **URL:** \ **Category:** Nutrients\ **Created:** [May 24, 2021, 9:03pm UTC](https://ilgmforum.com/t/question-about-ph-and-runoff/68016 "2021-05-24T21:03:35Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Shirkules](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/shirkules/32/601805_2.png) [@Shirkules](https://ilgmforum.com/u/Shirkules)\ **Post date:** [May 24, 2021, 9:03pm UTC](https://ilgmforum.com/t/question-about-ph-and-runoff/68016/1 "2021-05-24T21:03:35Z")
Water going in is @ 6.5 Coming out @ 5.9- 5.7. Is that about right? I only have a Ph/temp tester. ---
**Author:** ![MidwestGuy](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/midwestguy/32/914277_2.png) [@MidwestGuy](https://ilgmforum.com/u/MidwestGuy)\ **Post date:** [May 24, 2021, 9:09pm UTC](https://ilgmforum.com/t/question-about-ph-and-runoff/68016/2 "2021-05-24T21:09:06Z")
Runoff coming out should be ~6.5 for a soil grow. If the runoff pH has dipped it probably means you have some salt buildup in your soil (assuming it’s a mature plant that has been fed nutes at least a few times.) 5.7 will be a challenge to get to 6.5 just with pH up. It may be time for a flush. A flush should bring it back to ~6.5. ---
**Author:** ![BobbyDigital](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/bobbydigital/32/1220557_2.png) [@BobbyDigital](https://ilgmforum.com/u/BobbyDigital)\ **Post date:** [May 24, 2021, 9:09pm UTC](https://ilgmforum.com/t/question-about-ph-and-runoff/68016/3 "2021-05-24T21:09:21Z")
That’s been pretty normal when using ocean forest and big rootz soils. ---
**Author:** ![Dave101](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/dave101/32/398878_2.png) [@Dave101](https://ilgmforum.com/u/Dave101)\ **Post date:** [May 24, 2021, 9:26pm UTC](https://ilgmforum.com/t/question-about-ph-and-runoff/68016/4 "2021-05-24T21:26:18Z")
What’s the plant telling you, dose she look nice and healthy? If so I wouldn’t worry about runoff numbers, keep 6.5 in and don’t stress to much. Like Midwest said, if your feeding salt based nutrients and tanked your ph by over feeding,that’s a different story, although the plant would be showing leaf issues. ---
**Author:** ![Shirkules](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/shirkules/32/601805_2.png) [@Shirkules](https://ilgmforum.com/u/Shirkules)\ **Post date:** [May 24, 2021, 11:25pm UTC](https://ilgmforum.com/t/question-about-ph-and-runoff/68016/5 "2021-05-24T23:25:51Z")
I’m getting some yellowing leaves. ![20210523_125108](https://global.discourse-cdn.com/growingmarijuana/original/4X/1/a/4/1a45fadb4e0b8f7d270b9a568db4c66316c43f30.jpeg) ![20210523_125024](https://global.discourse-cdn.com/growingmarijuana/original/4X/e/5/9/e59b668afef12a2e31c60034b294a9fcd482ede4.jpeg) ---
**Author:** ![Shirkules](https://sea2.discourse-cdn.com/growingmarijuana/user_avatar/ilgmforum.com/shirkules/32/601805_2.png) [@Shirkules](https://ilgmforum.com/u/Shirkules)\ **Post date:** [May 24, 2021, 11:27pm UTC](https://ilgmforum.com/t/question-about-ph-and-runoff/68016/6 "2021-05-24T23:27:45Z")
I read something that said the brown spots could be calcium deficiency or possibly nute lock. /shrug… Thank you ---
**Author:** ![DPCBassman](https://avatars.discourse-cdn.com/v4/letter/d/b9bd4f/32.png) [@DPCBassman](https://ilgmforum.com/u/DPCBassman)\ **Post date:** [June 1, 2021, 1:27pm UTC](https://ilgmforum.com/t/question-about-ph-and-runoff/68016/7 "2021-06-01T13:27:09Z")
I too have similar readings of runoff: pH 5.74 and 5.33 from two Autos. Neither of which have any signs of discoloration on the leaves. However, on my next watering or feeding, I’ll be sure to pH-up a bit. Now on to where I do see nutrient or mineral issues. See below, from a separate posting of mine: To SCROG or not to SCROG Photos and Nutes. I have VERY similar issues visible and was advised to use some Calcium & Magnesium; on it’s way to my door. I’ll be adding some later this week. I did not do a runoff test on these, but will later today and will try to post my pH readings for comparison. However, I’m not so trusting of my Vivosun pH meter/pen at this point. Just sayin’… ![20210530_141715](https://global.discourse-cdn.com/growingmarijuana/original/4X/9/c/4/9c48c64eb8c2fb71e0f131771644a6dae9a7919b.jpeg) ![20210530_141729](https://global.discourse-cdn.com/growingmarijuana/original/4X/6/4/9/649d6bdd5d9d704dd21e6a37ea8a1ce45e05a701.jpeg)